You went to a bar for a drink. Luckily if alcohol wasn’t your thing, they also had soda so you would be satisfied

You then see a pal of yours, Captain Beidou. She was having a drink with a girl you never met before. Beidou then notices you

Beidou: Aye buddy! Over here.

You walk over to them

Eula: Beidou… who is this?

Beidou: It’s my friend. Go on, introduce yourself. Don’t be shy~ She giggles